Miniature incandescent lamp



'Sept. '1, 193 J. F. DCNOVAN 2,053,138

MINIATURE INCANDES CENT LAMP Filed June 20, 1955 Fig. 2.

Inventor John F Donovan,

is Attorney.

Patented Sept. I, 1936 screens:

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4 Claims.

My invention relates to electric lamps and more particularly to the base or terminal portion there- J of which, when fitted into an appropriate socket,

- following description of species thereof and from my invention; Fig. 3 is a section at the line 3,-3 I

the drawing.

In the drawing Figs. 1 and 2 are front and side elevations of an incandescent lamp comprising of Fig. 2; Fig. 4 is a modification; Fig. 5 is a section at the line 55 of Fig. 4; Fig. 6 is a somewhat diagrammatic elevation partly in section of apparatus used in the manufacture of the modification in Fig. l; and Fig. 7 is an elevation, part- 117 in section, of a receptacle having one of the lamps comprising my invention mounted therein.

Referring to Figs. 1 to 3, the lamp comprises a bulb it having a reduced cylindrical neck portion it and containing a filament it mounted on lead wires 3 which are held in spaced relation by a glass head it. The lamp is of the butt-seal type in which portions of the leads it are sealed in the glass of the joint formed by the end of the rectly inserted in a socket andto prevent it from rotating therein, the neck portion iiis preferahly provided with apair of longitudinally extending protuberances it which are preferably blown therein at the time the bulb is blown.

In the modification shown in Figs. and 5, the outer leads it are held in place by a band it of plastic insulating material, such as sealing wan or cement. encircling the neck ll of the bulb and having protuberances 20 in which the said outer leads are embedded. The said band l9 may be applied to the neck portion H of the bulb from the periphery of a rotating disc or wheel 24 (Fig. 6) which carries the insulating material up from a container 25 and is brought in contact with the said neck H to deposit the insulating material thereon. The periphery of the said wheel is provided with notches 26 which carry an excess of the insulating material to form the protuberant portions 20 of the band iii.

In Fig. 7, the lamp I0 is shown mounted in a receptacle 2! of the imitation candle type which comprises a tube 22 of insulating material, such as cardboard having a pair of arcuate terminal members 23 mounted therein. The longitudinal protuberances i8 on the bulb neck I! flt'between the sides of the terminal members 23, it being impossible to insert the lamp in any other position. The said protuberances l8 thereby insure that the lamp is correctly positioned in the receptacle or socket so that the outer leads I6 are in contact withthe socket terminals 23, and they also prevent rotation of the lamp in the socket so that the leads it cannot be twisted off.

What I claim as new and desire to secure by Letters Patent of the United States is:

1. An electric lamp comprising a bulb having a neck portion, a pair of lead wires having portions thereof sealed in the walls of said neck portion and extending longitudinally of said neck portion on opposite sides of theouter surface thereof and a band of insulating material encircling said neck portion of said bulb and the ends of said lead wires for holding said lead wires in position on said neck portion of said bulb. Y

2. An electric lamp comprising a'bulb having'a neck portion, a pair of lead wires having portions thereof sealed in the walls of said neck portion and extending longitudinally of said neck portion on opposite sides of the outer surface thereof and a band. of plastic insulating materialencircling 

